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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <ctype.h>
# CTOX -- Convert a character string into a complex number. The complex
# number must have the form (r,i), with no embedded whitespace (GCTOX is
# cabable of accepting numbers in other formats).
int procedure ctox (str, ip, xval)
char str[ARB]
int ip, ip_save
double dval1, dval2
complex xval
int ctod()
define notanumber_ 99
begin
while (IS_WHITE (str[ip]))
ip = ip + 1
ip_save = ip
dval2 = 0.0d0
if (str[ip] == '(') { # x = (r1,r2)
ip = ip + 1
if (ctod (str, ip, dval1) <= 0)
goto notanumber_
if (str[ip] != ',')
goto notanumber_
ip = ip + 1
if (ctod (str, ip, dval2) <= 0)
goto notanumber_
if (str[ip] != ')')
goto notanumber_
ip = ip + 1
} else
goto notanumber_
if (IS_INDEFD(dval1) || IS_INDEFD(dval2))
xval = INDEFX
else
xval = complex (dval1, dval2)
return (ip - ip_save)
notanumber_
ip = ip_save
return (0)
end
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